This is the 2nd time this has happened to me. I uploaded my favorites to both my 665 and my 595. All the addresses have been changed. The coordinates are correct and they show in the proper place on the map, but the address, including my house, have been change to one of 3 different addresses.

I have a lot of backups of my favorites. When I import one of my backups it changes them also.

I was wondering if anyone else has had this problem. Of course Garmin can't explain it and said they have never heard of it.

Sounds like you have some stray gpx files. Open the GPX folder through your PC and delete all the .gpx files. Reboot your device and delete all your favourites then resend the correct ones using BaseCamp.

Your Zumo cannot change the information you have in BaseCamp unless you import data from your Zumo. If you delete all the gpx files as I explained and then using the menu on your Zumo delete all your favourites they'll be nothing there to import.